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United States Patent | 5,504,926 |
Jackson | April 2, 1996 |
A pair of data processing systems, each of the data processing system having a host central processor and an associated controller including memory, both of the data processing systems to be cooperatively associated with a number of disk drive memory units, each of the disk drive memory unit coupled to both said controllers. Either one of the host central processors can appropriate any one of the disk drive memory units as a selected disk drive memory unit by propagating path-control-data to the memory in both of the controllers arid in the selected disk drive memory unit.
Inventors: | Jackson; Gary E. (Lake Forest, CA) |
Assignee: | Unisys Corporation (Blue Bell, PA) |
Appl. No.: | 949967 |
Filed: | September 24, 1992 |
Current U.S. Class: | 710/5; 700/2; 710/36; 711/112; 711/148 |
Intern'l Class: | G06F 012/00; G06F 012/02; G06F 013/00; G06F 013/14 |
Field of Search: | 364/200,131 395/275,325,200,200.01,425,725,825,856,475,439 |
4455621 | Jun., 1984 | Pelley et al. | 364/900. |
4747043 | May., 1988 | Rodman | 364/200. |
4759010 | Jul., 1988 | Murata et al. | 370/58. |
5060140 | Oct., 1991 | Brown et al. | 364/200. |
5261072 | Nov., 1993 | Siegel | 395/425. |
5295247 | Mar., 1994 | Chang et al. | 395/325. |
5325488 | Jun., 1994 | Carteau et al. | 395/275. |